CN209658332U - Automobile starting lithium iron phosphate storage battery startup power supply - Google Patents

Abstract

A kind of automobile starting lithium iron phosphate storage battery startup power supply disclosed by the utility model, it is intended to solve the problems, such as that current traditional lead acid batteries weight weight, volume is big, service life is short, efficiency for charge-discharge is low, self-discharge rate is big.The utility model is achieved by following technical proposals: battery pack contains multiple monomer lithium iron phosphate storage batteries being connected in series, and it is filled by flame retardant filler, battery pack+, pole is fastened on the lithium battery protection board below top cover by connecting wire, lithium battery protection board is connected to battery anode B+, the capacitor C1 of positive temperature coefficient resistor R1 between cathode B-, and it is connected to the control chip DW01 between the capacitor C1 of positive temperature coefficient resistor R1, control the pin 5 of the 1st foot 8205A input terminal of chip DW01 output end, the pin 4 of the 3rd foot of output end connection 8205A output end, the 2nd foot of output end passes through resistance R2 and couples the pin 2 of 8205A output end, 3.

Description

Automobile starting lithium iron phosphate storage battery startup power supply

Technical field

The utility model relates to a kind of lithium iron phosphate storage batteries for being mainly used for automobile starting, in particular for new energy vapour The lithium electrification storage battery of vehicle low voltage starting.

Background technique

Battery (Storage battery), refer to it is all electricity with can be recharged after to a certain extent, The general name of the chemical energy battery of Reusability.Why also known as rechargeable battery (Rechargeablebattery) can charge It is because its chemical action its chemical action after connecting external power supply can be reversed.The chemicals that battery is made has very much Kind, it also has nothing in common with each other in design；Therefore, voltage, capacity, apparent size, weight are also had nothing in common with each other.Automobile starting battery Importance is many times also more important than big battery, but everybody has ignored the importance of automobile starting battery.Automobile start Battery does not work, and big battery has electricity that can not also release.So automobile starting battery is important in new energy vehicle power supply supply chain Property should be primary.General automobile starting battery is mostly based on lead-acid battery.What good lead-acid battery had can also Poor with a 2 or three years, some is used in conjunction all to take less than for 1 year and just break down.And its plumbic acid material included of most serious is again Serious pollution can be caused to human body and environment.Due to battery performance after plumbic acid over-discharge, there is tremendous influence in the service life, and lead-acid battery is put Electricity is only capable of being put into 70% of design capacity or so with regard to serious under-voltage, and Current Voltage avalanche type glides, and voltage can be made after being lower than 10V At various vehicle troubles.

Current existing new energy vehicle all uses lead-acid battery, and lead-acid battery charge efficiency is low (70% or so), the charging time Long, capacity is low, and discharge current spread of voltage largely will affect vehicle use feeling.Furthermore due to charge efficiency Low, over-burden by DCDC, and since electrical appliance is more in driving, automobile starting battery voltage reduces DCDC and just constantly fills to plumbic acid Electricity causes big battery electricity unnecessarily to lose, influences course continuation mileage.With this battery on gasoline car can fuel-efficient 5% or more, by Voltage can be reduced with the reduction of capacitance in lead-acid battery, but the voltage of lithium iron battery is very stable (13.2V), Therefore higher more stable voltage, electric current can constantly be remain to the ignition system of automobile, the ignition energy of spark plug is sufficient, and one Optimal situation is directly remain, automobile is allowed to guarantee that the gasoline in each cylinder can be with completely burned, automobile horsepower when running at high speed Increase, it certainly also just more can be fuel-efficient.Lithium iron battery is not allowed easy to aging.Lithium iron battery is a kind of battery in lithium battery family, Positive electrode is mainly LiFePO 4 material referred to as lithium iron battery again.With automobile starting battery made of iron lithium material, not only The problem of not polluting, but also have the advantages that following lead-acid battery is short of: without adding water, with preceding substantially without charging. It is made of high end materials, it is not on fire, it does not explode, no liquid is excessive.Product is small, light-weight, is convenient for carrying.Through 2000 SOC 0% After~100% repeats charge and discharge, the attenuation rate of capacitance, also within only 15%, that is to say, that if, it is normal in normal environment It is all out of question with 10 years under use.And conventional lead acid battery charge and discharge number is at 300 times or so, if 0%~100% charge and discharge of SOC Electricity, plumbic acid only tens of time service life.Due to the internal structure of lithium battery, lithium ion cannot all shift to anode when electric discharge, A part of lithium ion must be retained in cathode, to guarantee that lithium ion can unimpededly be embedded in channel in charging next time.Otherwise, electric The pond service life can shorten.In order to guarantee that there are part lithium ions after discharging in graphite linings it is necessary to strictly limiting the minimum electricity of discharge off Pressure, that is to say, that lithium battery is unable to overdischarge.The final discharging voltage of single lithium battery is usually 3.0V, minimum to cannot be below 2.5V.Battery discharge time length is related with battery capacity, discharge current size.Battery discharge time (hour)=battery holds Amount/discharge current, and 3 times of battery capacity are not to be exceeded in lithium battery discharge current (mA), such as: the lithium battery of 1000mAh, then Discharge current should be strict controlled within 3A, otherwise can make cell damage.

The people of driving both knows about, and when winter, is not easy to strike sparks after automobile parking is long, this has resulted in car owner Worried problem.Lithium battery in new-energy automobile, safety and cycle life are the cokes of new-energy automobile industrial application Point, lithium battery group how stable operation, how to improve the service efficiency of battery, increase the continual mileage of automobile, extending battery makes With the service life, reduce operating cost.How failure rate to be reduced to it is lower, how failure occur before early warning, this is according to new energy Automobile power cell problem to be solved.Battery producer does not release lithium iron phosphate storage battery at present, and according to iron lithium The characteristic of battery can theoretically be used to substitute lead-acid battery completely.The characteristics of automotive lead-acid battery is exactly can be big Current discharge, electric current can achieve hundreds of peaces when starting.It can be with large current charge, memory-less effect and to charging after starting As long as of less demanding, voltage is ok not higher than 14.8v.It does not need constant-current charge, size of current and can charge, risk It is low, performance is more stable.The disadvantage is that energy density is low, self-discharge rate is big, cumbersome, and the service life is short.Ferric phosphate lithium cell once existed It is widely applied on electric car, but later because the reasons such as energy density is low are gradually replaced by ternary lithium battery, BYD is drawn Think that proud iron cell is exactly ferric phosphate lithium cell battery.Also gradually replaced at present by ternary lithium battery.Ferric phosphate lithium cell list Bulk voltage 3.2V, charge cutoff voltage 3.6v.If with four string N are needed on automobile simultaneously, voltage then between 12.8-14.4v, This voltage is that there is no problem for automobile starting.Lithium iron battery supports heavy-current discharge, standard 3~5C of discharge current high Electric current continuous discharge supports 10c, the electric current that sparks to can achieve 20C or more.This be also why a slight charger baby The principle of automobile can be started.Such as capacity is the lithium iron battery of 12V 8AH, electric current can be light when being sparked with 20C electric current Pine reaches 160 peaces or more!And the lithium iron battery of capacity 20AH, instant starting currents can achieve 400 peaces or more, starting automobile milli No pressure.Lead-acid accumulators of the lithium iron phosphate storage battery starting current also than same capacity are much larger, and voltage is also above plumbic acid when starting Battery.So can be more smooth than lead-acid battery when vehicle launch.It is efficient due to electric discharge, it also increases LiFePO4 automobile and rises The utilization rate of dynamic battery discharge, 12V loss are few.For example, if DCDC charges to small lead-acid battery, that is, DCDC is supplied Kilowatt-hour, plumbic acid can deposit 600wh-800wh, remaining 400-200wh is lost, and electric discharge, plumbic acid discharging efficiency almost belongs in endpiece In invalid electric discharge, the electricity for being also equal to the actually available releasing of 600-800wh that this is deposited into only has 400-500wh appearance.Power electric What pond was given once supplies electricity to low pressure 12V, and ability 0.4-0.5 degree finally can be used, and the loss of power battery for no reason is carried out in natural zone, increases power consumption Amount, continuation of the journey are reduced.Same lead-acid battery, stops working immediately when electricity consumption is big, and big electricity can not disconnect immediately, because of lead-acid battery Power shortage, power battery, which must work on, mends electricity to normal range (NR) to automobile starting battery.Power battery capacity is wasted, here it is fall Electric fault.Since lead-acid battery discharges be only capable of being put into design capacity 70% or so with regard to serious under-voltage, electric current, voltage avalanche type It glides, then last voltage causes various vehicle troubles, battery performance after plumbic acid over-discharge lower than 10V, there is tremendous influence in the service life.

Utility model content

The utility model in view of the shortcomings of the prior art place, provide it is a kind of be mainly used for new cars starting phosphoric acid Lithium iron battery startup power supply, low pressure lithium iron phosphate storage battery, to solve, current traditional lead acid batteries weight weight, volume is big, makes With the problem that the service life is short, self-discharge rate is big, the safety that lithium-ions battery easily occurs in use can also be solved and asked Topic.

The technical scheme in the invention for solving the technical problem is, a kind of automobile starting is started with lithium iron phosphate storage battery Power supply, including the battery pack 6 being fixedly installed in 4 shell cavity of battery case, which is characterized in that battery pack 6 contains multiple strings Monomer lithium iron phosphate storage battery made of connection, and being filled by flame retardant filler 5, battery pack 6+,-pole connected by connecting wire 3 Connect on the lithium battery protection board 2 being fixed below top cover, lithium battery protection board 2+,-pole be electrically connected be arranged on top cover Lithium battery protection board 2 is connected to the electricity of the positive temperature coefficient between battery pack 6 anode B+, cathode B- on two battery electrode columns 1 of side The capacitor C1 of R1, and the control chip DW01 being connected between the capacitor C1 of positive temperature coefficient resistor R1 are hindered, chip is controlled The connection of the 1st foot of DW01 output end is built-in with the pin 5 of the 8205A input terminal of high-accuracy voltage detection circuit and delay circuit, defeated The 3rd foot of outlet connects the pin 4 of 8205A output end, and the 2nd foot of output end passes through resistance R2 and couples the pin of 8205A output end 2,3；When battery core is discharged by external load, the voltage of battery core will be reduced slowly, while be controlled chip DW01 and will be led to Positive temperature coefficient resistor R1 real-time monitoring battery core voltage is crossed, under normal circumstances, conducting particles constitutes conductive path in tree vinegar, Resistance R1 shows as Low ESR；When there is over-current phenomenon avoidance generation in circuit, battery core voltage is in overdischarge voltage status, soon The output voltage for disconnecting the 1st foot makes the 1st foot voltage become 0V, the switching tube in 8205A because draw 5 foot no-voltage due to close, flow The heat that high current through positive temperature coefficient resistor R1 generates expands polymer tree vinegar matrix material, between cutting conducting particles Connection, to play overcurrent protection to circuit, after failure solution, resistance R1 automatically restores to original state, guarantees circuit It works normally.

The utility model has the advantages that compared with the prior art.

It is small in size.The utility model uses and contains multiple monomer lithium iron phosphate storage batteries being connected in series, and fire-retardant The battery pack that filler 5 is filled, it is small in size compared to lead-acid battery.It is light-weight.Total weight, volume are equivalent specifications lead-acid batteries 1/3, either old man, women, or children can easily carry.It is special with start and stop fuel vehicle for new energy electric motor vehicle The ferric phosphate lithium cell (directly replacement AGM/EFB lead-acid accumulators) of the big multiplying power discharging, charging developed is in addition to long-life (He Cheshou Order essentially the same, no replacement is required within 10 years or more), stablize, efficient discharge, the outer parameter of charging and lead-acid battery are completely the same.Entrucking Excellent effect after actual measurement, it is fuel oil more fuel-economizing, electronic more power saving that maximum, which is taken on a new look,.

Long service life.High/low temperature charge-discharge performance is all far superior to lead-acid battery, the electricity of the same fully charged needs of capacity Amount is lower than the fully charged institute's electricity demand of plumbic acid, and the service life is 3~5 times of lead-acid battery.Because lead-acid battery self-discharge rate is high (daily about 0.2-0.5%), electricity is substantially without substantially can not normal use again after placing 1 year.Conservative estimation low 25~30% is also Assume that plumbic acid design capacity 800wh needs 1.2 or so degree electricity full of automobile starting battery, the utility model it is only necessary to less than 0.9 degree of electricity can be full of.Saving the electricity come out can be used in driving.Product electric discharge can be put into 95% of design capacity or more and Not under-voltage, voltage is higher than 12.4V, and due to the excellent characteristics of LiFePO4, even if discharging into 95% or more, charge also not shadow again Battery performance and service life are rung, can be full of within one hour.It is born since efficient charge and discharge (95% efficiency) significantly reduce DCDC Load, reduces the amount that big battery charges to automobile starting battery, as much as possible guarantees that big battery electricity is all used to drive, and increases continuous Boat.Real maintenance-free, replacement may be implemented, solve lead-acid accumulator next year replacement problem.Automobile starting battery is put certainly Electricity is low, and year self discharge is lower than 10%, and reusing does not influence performance and service life.

The stability of brake system improves.Due to LiFePO4 powered stable, will not be influenced to cause electricity by big load electricity consumption Pressure fluctuation, ferric phosphate lithium cell can guarantee 12V electrical voltage system between 13.3-14.4V.(lead-acid battery is in big load electricity consumption Time voltage fluctuation wants stable operating voltage to maintain 12.8V or more, such system the operation is stable for 11.5-14.6V) low pressure 12V Property is just very high.

Efficiency for charge-discharge improves.The utility model collectively constitutes lithium electricity using 8205A enhancement mode MOSFET and DW01 Circuit is protected in pond, and by LiFePO4 automobile starting battery, test synthesis Bidirectional charging-discharging efficiency is higher than 90%, compared to plumbic acid Battery, charging, discharging efficiency about 60%-80%, 95% or more ferric phosphate lithium cell charging and discharging efficiency are used in big load low pressure 12V Efficiency is in a disguised form improved when electric, alleviates the burden that DCDC charges to automobile starting battery.The utility model uses high power Rate, high density aluminum hull VDA LiFePO4 battery core, the charging time is short (being designed as 0.8~1C charging), discharge current voltage stabilization, Discharge sustainable 5C, and peak value 10C or more is had excellent performance, and secure and non-combustible burning is not exploded.Even if positive and negative anodes short circuit is protected due to lithium battery Backplate intervention (is more than or equal to 1000A short circuit current), and general supply disconnects in 50ms, if short circuit, which always exists, to be disconnected always Power supply to short circuit releases.In the big load electricity consumption of full vehicle, efficiently charging, one side efficient discharge guarantee vehicle low voltage on one side It is in optimum state forever.

Detailed description of the invention

Fig. 1 is the cross-sectional view of the utility model automobile starting lithium iron phosphate storage battery startup power supply.

Fig. 2 is the utility model battery protecting circuit schematic illustration.

Fig. 3 is the utility model lithium battery protection board wiring diagram.

In figure: 1 battery electrode column, 2 lithium battery protection boards, 3 connecting wires, 4 battery cases, 5 flame retardant fillers, 6 battery packs.

Specific embodiment

Refering to fig. 1, Fig. 2.In the preferred embodiment for only allowing to describe, a kind of automobile starting is started with lithium iron phosphate storage battery Power supply, including the battery pack 6 being fixedly installed in 4 shell cavity of battery case.Battery pack 6 contains multiple monomers being connected in series Lithium iron phosphate storage battery, and being filled by flame retardant filler 5, battery pack 6+,-pole top cover is fastened on by connecting wire 3 On the lithium battery protection board 2 of lower section, lithium battery protection board 2+,-pole be electrically connected two batteries being arranged in above top cover Lithium battery protection board 2 is connected to the capacitor C1 of the positive temperature coefficient resistor R1 between battery pack 6 anode B+, cathode B- on pole 1, And it is connected to the control chip DW01 between the capacitor C1 of positive temperature coefficient resistor R1, control the 1st foot of chip DW01 output end Connection is built-in with the pin 5 of the 8205A input terminal of high-accuracy voltage detection circuit and delay circuit, the connection of the 3rd foot of output end The pin 4 of 8205A output end, the 2nd foot of output end pass through resistance R2 and couple the pin 2,3 of 8205A output end；When battery core passes through When external load is discharged, the voltage of battery core will be reduced slowly, while controlling chip DW01 will be by positive temperature coefficient electricity R1 real-time monitoring battery core voltage is hindered, under normal circumstances, conducting particles constitutes conductive path in tree vinegar, and resistance R1 shows as low Impedance；When there is over-current phenomenon avoidance generation in circuit, battery core voltage is in overdischarge voltage status, soon disconnects the defeated of the 1st foot Voltage out makes the 1st foot voltage become 0V, the switching tube in 8205A because draw 5 foot no-voltage due to close, flow through positive temperature coefficient The heat that the high current of resistance R1 generates expands polymer tree vinegar matrix material, the connection between conducting particles is cut off, thus right Circuit plays overcurrent protection, and after failure solution, resistance R1 automatically restores to original state, guarantees that circuit works normally.

In an alternate embodiment of the invention, DW01 includes advanced power MOSFET, high-precision voltage detecting circuit and is prolonged When circuit.DW01, which has, to be overcharged, over-discharge, overcurrent, defencive function needed for all batteries such as short circuit, and power consumption is very when working It is low.The nominal voltage 3.2V of LiFePO4 battery core, when single battery core voltage is when 2.5V is between 4.3V, the 1st foot of DW01, 3 feet export high level (being equal to supply voltage), and the 2nd foot voltage is 0V.The 1st foot of DW01, the 3rd foot voltage will be respectively at this time It is added to the pin 5 of 8205A, two electronic switches in 4,8205A are in and lead because its pole G is connected to the voltage from DW01 Logical state, i.e. two electronic switches are in open state.The end P- of the cathode and lithium battery protection board of battery core is equivalent to directly at this time Lead in succession, lithium battery protection board has voltage output.

Lithium battery protection circuit can be by controlling IC, MOS switch pipe, fusingFuse, resistance, the elements composition control such as capacitor High-accuracy voltage detection circuit built in IC processed and multistage current detection circuit, MOS switch pipe 8205A.Wherein, voltage detecting electricity Road once reaching its given threshold (usually 3.9V~4.4V), immediately enters overcharge first is that detect to charging voltage Guard mode；Second is that detected to discharge voltage, once reach its given threshold (usually 2.0V~3.0V), immediately into Enter over state.As shown in Figure 2.In normal situation, control IC output signal control MOS switch pipe conducting makes electricity Core is connected with external circuit, and when battery core voltage or loop current are more than specified value, metal-oxide-semiconductor shutdown is immediately controlled in it, to protect electricity The safety of core.In the circuit, MOS switch pipe mostly uses slim TSSOP-8 or SOT23-6 packing forms.In this circuit arrangement Positive temperature coefficient resistor R1 mainly plays superheat protecting function, i.e., when battery itself or its ambient temperature increase, NTC element Resistance value reduces, and is reacted in time using electric equipment or charging equipment, if temperature is more than certain value, system enters protection shape State stops charge and discharge.Lithium battery protection board over control principle.When battery core is discharged by external load, The voltage of control chip battery core will be reduced slowly, while will work as battery core by resistance R1 real-time monitoring battery core voltage inside DW01 When voltage drops to about 2.3V, DW01 will be considered to battery core voltage and be in overdischarge voltage status, soon disconnect the defeated of the 1st foot Voltage out makes the 1st foot voltage become 0V, and the switching tube in 8205A is closed due to 5 no-voltage of pin.The B- and guarantor of battery core at this time It is in an off state between the P- of backplate.I.e. the discharge loop of battery core is cut off, and battery core will stop discharging.Protection circuit was in Discharge condition is simultaneously always maintained at.After connecting charging voltage between the P and P- of protection circuit, control chip DW01 is detected through B- Soon stop over-discharge state after to charging voltage, again in the 1st foot output HIGH voltage, makes the over-discharge electric control in 8205A Pipe conducting, the i.e. P- of the B- of battery core and protection circuit are connected again, and the charged device of battery core plugs in.

Lithium battery protection board additives for overcharge protection control principle.When battery is charged normal by charger, when with charging Between increase, the voltage of battery core will be higher and higher, and when battery core voltage is increased to 4.4V, DW01 will be considered to battery core voltage and be in Overcharge voltage state, soon disconnect the 3rd foot output voltage, so that the 3rd foot voltage is become 0V, the switching tube in 8205A because 4th foot no-voltage and close.It is in an off state between the B- of battery core and the P- of protection board at this time.That is the charge circuit quilt of battery core Cutting, battery core will stop charging.Protection board is in overcharge condition and is always maintained at.It is put until being connected between the P and P- of protection board After electric loading, although being closed because overcharging electric control switch pipe at this time, the side of its internal diode positive direction and discharge loop To identical, therefore discharge loop can discharge, and when the voltage of battery core is placed to lower than 4.3V, DW01 stops additives for overcharge protection State makes to overcharge the conducting of electric control pipe in 8205A, i.e. the B- of battery core and protection board P- are again again in the 3rd foot output HIGH voltage Again it connects, battery core can be carried out normal charge and discharge again.

Refering to Fig. 3.Lithium battery protection board wiring diagram, ferric phosphate lithium cell group 6 and the connecting wire 3 of lithium battery protection board 2 Welded connecting gets up, and battery component can be the concatenated lithium battery of 3-6 block, and battery anode B+ meets B1+, B2+, B3+, B4+, bears Pole B- meets B1-, B2-, B3-, B4-.Anode meets charge/discharge P+, and cathode meets charge/discharge P-.B+, B- connect respectively The positive and negative electrode of battery core；P+, P-are the positive and negative electrode of protection board output respectively；DWO1 or 312F is a li-ion cell protection core Piece is built-in with the voltage detecting and time delay circuit of pinpoint accuracy.When battery core voltage is between 2.5V~4.3V, DW01's 1., 3. foot exports high level (be equal to supply voltage), 2. foot voltage is 0V.Two N-channel field-effect tube in 8205A at this time Q1, Q2 are on state, due to the conducting resistance very little of 8205A, are equivalent to D, S interpolar and lead directly to, at this time the cathode of battery core It is equivalent to the end P- of protection circuit and is directly connected to, protection circuit has voltage output.In this circuit arrangement, field-effect inside 8205A Pipe Q1, Q2 can be equivalent to two switches, when the G pole tension of Q1 or Q2 is greater than 1V, switching tube conducting, and internal resistance very little (number between D, S Ten milliohms), it is equivalent to and closes the switch；When G pole tension is less than 0.7V, switching tube ends, and the conducting internal resistance of D, S interpolar is very big (several megohms) are equivalent to switch and disconnect.When battery core is discharged by external load, the voltage at battery core both ends will slowly It reduces, while will be commonly referred to as when battery core voltage drops to 2.3V(by resistance R1 real-time monitoring battery core voltage inside DW01 Put protection voltage) when, DWO1 thinks that battery core has been in over-discharge state, and 1. foot voltage becomes Q1 cut-off in 0,8205A, this When battery core B- and-between be in an off state, i.e., the discharge loop of battery core be cut off, battery core by stop discharge, realize over-discharge Electric protection.Into after over state, battery core voltage can rise, if can rise to IC threshold voltage (generally 3.1V, Commonly referred to as Cross prevention restores voltage), the 1. foot of DW01 restores output high level, and the Q1 in 8205A is connected again.No matter protect Whether protection circuit enters over-discharge state, as long as adding charging voltage between the end P+ and P- of protection circuit, DW01 is through the one end B After detecting charging voltage, high level soon is exported from 3. foot, the Q2 conducting in 8205A, the i.e. B- of battery core protects circuit P- is logical, and charger charges to battery core, and current loop is as follows: charger anode → p+ → B+ → B-, 8205A 6., 7. foot 8. foot → 8205A of → 8205A 1. foot → 8205A 2., 3. foot → P- → charger cathode.When charging, when battery passes through When charger charges normal, with the increase in charging time, the voltage at battery core both ends will be gradually risen, when battery core voltage is increased to 4.4V(commonly referred to as overcharges protection voltage) when, DW01 will judge that battery core has been in overcharge condition, soon make 3. foot voltage It is reduced to 0V, the Q2 in 8205A ends due to 4. foot is low level, at this time between mono- pole B of battery core and the end P- of protection circuit It in off-state and keeps, i.e., the charge circuit of battery core is cut off, and stops charging.It is put when in P+ and the P- termination of protection circuit After electric loading, although Q2 ends, its internal diode positive direction is identical as the current direction of discharge loop, so still can be right Load discharge.Restore voltage when battery core both end voltage commonly referred to as overcharges protection lower than 4.3V() when, DW01 will move out overcharge Guard mode, 3. foot exports high level again, and Q2 conducting, the i.e. end B- of battery core connect again with the protection end circuit P-, battery core It can be carried out normal charge and discharge again.

There is also internal resistances when due to MOS switch pipe saturation conduction, thus when thering is electric current to flow through MOS switch pipe D, S interpolar Pressure drop, the voltage of protection control IC meeting real-time detection MOS switch pipe D, S pole, when voltage is raised to IC protection threshold value will be generated When (generally 0.15V, referred to as electric discharge over-current detection voltage), discharge prevention actuating station exports low level, control of discharge at once MOS switch pipe shutdown, discharge loop are disconnected.Realize overcurrent protection.

It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined Assert that specific embodiment of the present utility model is only limitted to this, for the utility model person of an ordinary skill in the technical field For, made several simple deduction or replace all shall be regarded as belonging to this without departing from the concept of the premise utility Utility model determines scope of patent protection by the claims submitted.

Claims (7)

1. a kind of automobile starting lithium iron phosphate storage battery startup power supply, including be fixedly installed in battery case (4) shell cavity Battery pack (6), which is characterized in that battery pack (6) contains multiple monomer lithium iron phosphate storage batteries being connected in series, and is hindered Fire filler (5) filling, battery pack (6)+,-pole be fastened on the li-ion cell protection below top cover by connecting wire (3) On plate (2), lithium battery protection board (2)+,-pole be electrically connected on two battery electrode columns (1) being arranged in above top cover lithium electricity Pond protection board (2) is connected to the capacitor C1, Yi Jilian of the positive temperature coefficient resistor R1 between battery pack (6) anode B+, cathode B- The control chip DW01 between the capacitor C1 of positive temperature coefficient resistor R1 is met, is controlled in the connection of the 1st foot of chip DW01 output end It is equipped with the pin 5 of the 8205A input terminal of high-accuracy voltage detection circuit and delay circuit, it is defeated that the 3rd foot of output end connects 8205A The pin 4 of outlet, the 2nd foot of output end pass through resistance R2 and couple the pin 2,3 of 8205A output end；When battery core is by external When load is discharged, the voltage of battery core will be reduced slowly, while controlling chip DW01 will be real by positive temperature coefficient resistor R1 When monitor battery core voltage, under normal circumstances, conducting particles tree vinegar in constitute conductive path, resistance R1 shows as Low ESR； When there is over-current phenomenon avoidance generation in circuit, battery core voltage is in overdischarge voltage status, soon disconnects the output electricity of the 1st foot Pressure, so that the 1st foot voltage is become 0V, the switching tube in 8205A because draw 5 foot no-voltage due to close, flow through positive temperature coefficient resistor The heat that the high current of R1 generates expands polymer tree vinegar matrix material, the connection between conducting particles is cut off, thus to circuit Overcurrent protection is played, after failure solution, resistance R1 automatically restores to original state, guarantees that circuit works normally.

2. automobile starting as described in claim 1 lithium iron phosphate storage battery startup power supply, it is characterised in that: DW01 includes Power MOSFET tube, high-precision voltage detecting circuit and delay circuit.

3. automobile starting as described in claim 1 lithium iron phosphate storage battery startup power supply, it is characterised in that: when single battery core For voltage when 2.5V is between 4.3V, the 1st foot, the 3rd foot of DW01 exports high level, and the 2nd foot voltage is 0V.

4. automobile starting as claimed in claim 3 lithium iron phosphate storage battery startup power supply, it is characterised in that: the 1st of DW01 Foot, the 3rd foot voltage are added separately to the pin 5,4 of 8205A, and two poles electronic switch G in 8205A meet DW01, are on shape State, the end P- of the cathode with lithium battery protection board of battery core is directly connected at this time.

5. automobile starting as described in claim 1 lithium iron phosphate storage battery startup power supply, it is characterised in that: when battery core voltage When dropping to about 2.3V, DW01 is in overdischarge voltage status, disconnects the output voltage of the 1st foot immediately, becomes the 1st foot voltage Switching tube in 0V, 8205A is closed due to 5 no-voltage of pin；I.e. the discharge loop of battery core is cut off, and battery core will stop discharging.

6. automobile starting as described in claim 1 lithium iron phosphate storage battery startup power supply, it is characterised in that: control chip DW01 soon stops over-discharge state after B- detects charging voltage, again in the 1st foot output HIGH voltage, makes in 8205A The conducting of over-discharge electric control pipe, i.e. the P- of the B- of battery core and protection circuit connects again, battery core charged device plug-in.

7. automobile starting as described in claim 1 lithium iron phosphate storage battery startup power supply, it is characterised in that: LiFePO4 electricity Pond group (6) and lithium battery protection board (2) are welded to connect with connecting wire (3), and battery component is the concatenated lithium electricity of 3-6 block Pond, battery anode B+ meet B1+, B2+, B3+, B4+, and cathode B- meets B1-, B2-, B3-, B4-, and battery anode, which connects, to charge/put Electric P+, cathode meet charge/discharge P-, and B+, B- are the positive and negative electrode for connecing battery core respectively；P+, P-are that protection board exports respectively Positive and negative electrode.